class Settings():

    def __init__(self):
        # 初始游戏框架、组件设置
        # Screen settings.
        self.screen_width = 1200
        self.screen_height = 800
        self.bg_color = (255,255,255)
        
        # 猎人设置
        self.ship_limit = 3
            
        # 子弹设置.
        self.bullet_width = 3
        self.bullet_height = 15
        self.bullet_color = 60, 60, 60
        self.bullets_allowed = 3
        
        # 猎人设置
        self.fleet_drop_speed = 10
            
        # 游戏速度
        self.speedup_scale = 1.1
        # 熊作为目标的移动设置增加
        self.score_scale = 1.5
    
        self.initialize_dynamic_settings()

    def initialize_dynamic_settings(self):
        # 贯穿始终的屏幕设置
        self.ship_speed_factor = 1.5
        self.bullet_speed_factor = 3
        self.alien_speed_factor = 1
        
        # 得分设置
        self.alien_points = 50
    
        # 掉头设置
        self.fleet_direction = 1
        
    def increase_speed(self):
        # 增加游戏难度
        self.ship_speed_factor *= self.speedup_scale
        self.bullet_speed_factor *= self.speedup_scale
        self.alien_speed_factor *= self.speedup_scale
        
        self.alien_points = int(self.alien_points * self.score_scale)